pressure-enthalpy chart

pressure-enthalpy chart

[′presh·ər ′en‚thal·pē ‚chärt]
(physics)
A graph of the pressure versus the enthalpy of a substance at various values of temperature, specific volume, and entropy; especially useful in refrigeration calculations. Also known as enthalpy-pressure chart.
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The two most commonly used charts are the temperatureentropy diagram and the pressure-enthalpy chart.
The pressure-enthalpy chart for a refrigerant contains a couple of boundary lines, representing the heat content of the fluid when it is liquid on the point of boiling (the saturated liquid line) and when it is gas on the point of condensing (the saturated vapor line).